package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.pojo.Category;
import com.itheima.reggie.pojo.Dish;
import com.itheima.reggie.pojo.Setmeal;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service    // 作用：标记当前类是一个Spring的Service组件，相当于在xml中配置了一个bean
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;

    @Autowired
    private SetmealService setmealService;

    @Override
    public void remove(Long id){
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        // 添加查询条件，根据分类id进行查询
        dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        int count1 = (int) dishService.count(dishLambdaQueryWrapper);
        // 查询当前分类是否关联了菜品，如果已经关联了菜品，抛出一个业务异常
        if (count1 > 0) {
            throw new CustomException("当前分类已经关联了菜品，不能删除");
        }
        // 查询当前分类是否关联了套餐，如果已经关联了套餐，抛出一个业务异常
        LambdaQueryWrapper< Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        int count2 = (int) setmealService.count(setmealLambdaQueryWrapper);
        if (count2 > 0) {
            throw new CustomException("当前分类已经关联了套餐，不能删除");
        }
        // 删除当前分类
        super.removeById(id);
    }
}
